Gracious after country gent wastes energy wriggling (7)

'wriggling' is the definition.
(thesaurus)

'gracious after country gent wastes energy' is the wordplay.
'gracious' becomes 'my' (I've seen this in other clues).
'after' says to put letters next to each other.
'country gent' becomes 'squire' (I've seen this in another clue).
'wastes' is a deletion indicator.
'energy' becomes 'e' (physics symbol as in E=mcy).
'squire' with 'e' taken away is 'squir'.
'my' after 'squir' is 'SQUIRMY'.