Sly call, pinching behind (6)
I believe the answer is:
crafty
'sly' is the definition.
('crafty' can be a synonym of 'sly')
'call pinching behind' is the wordplay.
'call' becomes 'cry' ('cry' can be a synonym of 'call').
'pinching' is an insertion indicator (taking inside).
'behind' becomes 'aft' ('aft' can be a synonym of 'behind').
'cry' enclosing 'aft' is 'CRAFTY'.
(Other definitions for crafty that I've seen before include "Sly" , "Cunning and artful" , "Cunning, deceitful" , "'Cunning, wily (6)'" , "Cunning and ingenious" .)