Gave one's playmates a hand (5)
I believe the answer is:
dealt
'gave' is the definition.
(dealing is a kind of giving)
'one's playmates a hand' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'hand' could be 'l' (abbreviation for left, as in the left-hand side) and 'l' is present in the answer.
The remaining letters 'det' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dealt that I've seen before include "Distributed playing cards" , "Doled out" , "Gave out playing cards" , "Carried out business" , "Delivered" .)