Arm-twisting? Getting robe over uniform (6)
I believe the answer is:
duress
'arm-twisting?' is the definition.
(I've seen this in another clue)
'robe over uniform' is the wordplay.
'robe' becomes 'dress' (I've seen this before).
'over' indicates putting letters inside.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'dress' going around 'u' is 'DURESS'.
'getting' is the link.
(Other definitions for duress that I've seen before include "Compulsion by use of force" , "Coercion, compulsion" , "Constraint, force" , "Hardship" , "Compulsory force or threat" .)