Crossword Genius

Coinage formerly found in swamp withdrawn (5,4)

Ross

I believe the answer is:

nonce word

'coinage' is the definition.
(thesaurus)

'formerly found in swamp withdrawn' is the wordplay.
'formerly' becomes 'once' ('once' can be a synonym of 'formerly').
'found in' indicates putting letters inside.
'swamp' becomes 'drown' (I've seen this before).
'withdrawn' is a reversal indicator.
'drown' reversed gives 'nword'.
'once' put inside 'nword' is 'NONCE-WORD'.

(Another definition for nonce word that I've seen is " Titilifarious maybe".)

I've seen this clue in The Guardian.
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