If recalled, clergyman will return note (5)
I believe the answer is:
fiver
'note' is the definition.
(fiver is a kind of note)
'if recalled clergyman will return' is the wordplay.
'recalled' says the letters should be written in reverse.
'clergyman' becomes 'rev' (I've seen this before).
'will return' is a reversal indicator.
'if' backwards is 'fi'.
'rev' backwards is 'ver'.
'fi'+'ver'='FIVER'
(Other definitions for fiver that I've seen before include "Bank note" , "Hazel's brother in Watership Down" , "Where to see portrait of Elizabeth Fry" , "Smallest English note" , "Note worth 500p" .)