Maintain a position in base where my team play? (5,4,6)
I believe the answer is:
stand ones ground
'maintain a position' is the definition.
'base where my team play?' is the wordplay.
I cannot quite understand how this works, but
'base' could be 'ground' ('ground' can be a synonym of 'base') and 'ground' is found within the answer.
'my' could be 'ones' ('one's' is a humorous equivalent to 'my') and 'ones' is located in the answer.
The remaining letters 'stand' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
(Other definitions for stand ones ground that I've seen before include "Refuse to move" , "Maintain personal position" .)