Parse 1 Across

[orchardian]

colleague in tie drinking chaser

[bookbinder]

Is that the clue? If not, then give us the clue.

[Lie-in King]

The clue reads "...a chaser"

Stablemate - 'b' ('a' chaser; comes next, in) 'stalemate' (tie)

[MargoTester]

Stablemate

[Toorak]

Stalemate (tie) around b (a chaser - follows a in the alphabet

I think there should be an a between drinking and chaser

[Captain2]

Colleague in tie drinking a chaser? (10)

Tie = Stalemate with B included (b 'chases' a in the alphabet)

Full clue always helps

[Neveracrossword]

Thanks, Lie-In King. I knew the answer but the OP asked for parsing...which I didn't know!

[MargoTester]

^ what Li-k said :-))

[Captain2]

It's the 'please' and 'thank you' that are missing which irks me more.

[bookbinder]

Captain2, this OP does not yet have a good track record in politeness, like many others. I, also, appreciate the niceties of politeness, and I have been advised to grow a thicker skin, but I cannot help wishing for a few more 'pleases' and 'thank yous'.