Crossword Genius

Lord, the old man turning up in a flap (6)

Ross

I believe the answer is:

earlap

'flap' is the definition.
(earlap is a kind of flap)

'lord the old man turning up' is the wordplay.
'lord' becomes 'earl' (earl is a kind of lord).
'the old man' becomes 'pa' (both can mean father).
'turning up' is a reversal indicator.
'pa' backwards is 'ap'.
'earl'+'ap'='EARLAP'

'in a' acts as a link.

I've seen this clue in The Guardian.
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