Hang about - Heather's got hesitation (6)
I believe the answer is:
linger
'hang about' is the definition.
(I've seen this before)
'heather's got hesitation' is the wordplay.
'heather' becomes 'ling' ('ling' can be a synonym of 'heather').
'got' is a charade indicator (letters next to each other).
'hesitation' becomes 'er'.
'ling'+'er'='LINGER'
(Other definitions for linger that I've seen before include "Delay departure" , "Dally, stay on" , "Tarry, hang around" , "Procrastinate" , "Hang back awhile" .)