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This is the quick parse for the Joint DIY COW crossword - for a full parse that breaks down each individual part of the clue click the imaginatively titled button to your right.

full solution

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Across
1 - ENGAGEMENT(RING)S
9 - A[n]D, ORATION
10 - [ba]N[al], AS+A+L.
11 - LAMB[a]DA
12 - O+S in STOCK* semi&lit
13 - DD
15 - RE.+SP.+ON+[steeplechas]SE
18 - HIDDEN
19 - P(LAY)UP
21 - RE(PUB)LIC
23 - BA(B[lyton]+B.)LE
26 - HIDDEN
27 - I+NAN, I+MATE
28 - PROMISING VENEER*

Down
1 - LEARN BE*
2 - MONOGRAM* - MAN*
3 - GRAND, S[pel]L, AM
4 - M + A + I +D
5 - NINE + TIES
6 - UNI in R[omanti]C
7 - NOSE, C 'AND' Y
8 - E[a]R PLUGS*
14 - AGNE[s] under CHAMP
16 - DD/PUN
17 - A, SP(I)RING
18 - RA in RANT*, E.
20 - P[opula]R, E. + CEDE
22 - LAB<, IT[ll]<
24 - BE A NO
25 - DD

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by alberyalbery, Apt, axe, bigbadmarty, Beezie, Bombadil, Bucko, crucifer, Dutch, gleety, Hoskins, ixion, JollySwagman, Lohengrin, newmarketsausage, Pulham, Rishi, Skipjack, eXternal, steveran and windsurfer.

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