Pal working on board (4)
I believe the answer is:
mate
'pal' is the definition.
(I've seen this before)
'working on board' is the wordplay.
I cannot quite see how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is found within the answer.
The remaining letters 'me' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mate that I've seen before include "China" , "Spouse or informal pal (4)" , "tea" , "Friend, companion" , "Fellow worker" .)