Crossword Genius

Penny's on edge, being prudish (4)

Ross

I believe the answer is:

prim

'prudish' is the definition.
('prim' can be a synonym of 'prudish')

'penny's on edge' is the wordplay.
'penny' becomes 'p'.
'on' says to put letters next to each other.
'edge' becomes 'rim' (rim is a kind of edge).
'p'+'rim'='PRIM'

'being' is the link.

(Other definitions for prim that I've seen before include "Demure" , "Affectedly dainty or refined" , "Old-maidish" , "Proper or prissy" , "Straight-laced" .)

I've seen this clue in The Telegraph.
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