Pressure to put symbol on fruit (5)
I believe the answer is:
prune
'fruit' is the definition.
(prune is a kind of fruit)
'pressure to put symbol' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'to put' is a charade indicator (letters next to each other).
'symbol' becomes 'rune' (rune is a kind of symbol**).
'p'+'rune'='PRUNE'
'on' acts as a link.
(Other definitions for prune that I've seen before include "Trim - dried fruit" , "Cut back the dried plum" , "Trim (tree); dried plum" , "A fruit; to cut back" , "Dull person" .)