Twist is feeble after tango (5)
I believe the answer is:
tweak
'twist' is the definition.
(I've seen this before)
'feeble after tango' is the wordplay.
'feeble' becomes 'weak' (similar in meaning).
'after' says to put letters next to each other.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'weak' put after 't' is 'TWEAK'.
'is' is the link.
(Other definitions for tweak that I've seen before include "Edit" , "Change slightly" , "Squeeze with the fingers" , "Pinch and twist" , "Minor change" .)