Crossword Genius

Fastens bottom on top of seat (7)

Ross

I believe the answer is:

buttons

'fastens' is the definition.
(buttoning is a kind of fastening)

'bottom on top of seat' is the wordplay.
'bottom' becomes 'butt' ('butt' can be a synonym of 'bottom'**).
'top of' suggests taking the first letters.
The initial letter of 'seat' is 's'.
'butt'+'on'+'s'='BUTTONS'

(Other definitions for buttons that I've seen before include "a role in pantomime" , "Pantomime pageboy; fasteners" , "Baron Hardup's servant in Cinderella" , "Secures" , "Fastens" .)

I've seen this clue in The Independent.
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