Crossword Genius

Rod turns up with Heather, whooping it up (9)

Ross

I believe the answer is:

revelling

'whooping it up' is the definition.

'rod turns up with heather' is the wordplay.
'rod' becomes 'lever' (I've seen this before**).
'turns up' says the letters should be written backwards.
'with' is a charade indicator (letters next to each other).
'heather' becomes 'ling' ('ling' can be a synonym of 'heather').
'lever' in reverse letter order is 'revel'.
'revel'+'ling'='REVELLING'

I've seen this clue in The Times.
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