Crossword Genius

German boy mounted popular British coin some years ago (6)

Ross

I believe the answer is:

florin

'british coin some years ago' is the definition.
(historical British coin)

'german boy mounted popular' is the wordplay.
'german boy' becomes 'rolf' (common German name).
'mounted' is a reversal indicator.
'popular' becomes 'in' ('in' can mean trendy).
'rolf' in reverse letter order is 'flor'.
'flor'+'in'='FLORIN'

(Other definitions for florin that I've seen before include "[SHILLINGS] ?" , "Old English coin worth 10p" , "Two bob, in old money" , "Old two-bob bit" , "Former British silver coin" .)

I've seen this clue in The Telegraph.
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