Crow picked up roll beneath sailor (7)
I believe the answer is:
jackdaw
'crow' is the definition.
(I've seen this before)
'picked up roll beneath sailor' is the wordplay.
'picked up' is a reversal indicator.
'roll' becomes 'wad' (roll of banknotes).
'beneath' says to put letters next to each other (in a down clue, some letters go beneath others).
'sailor' becomes 'jack' (informal term for a sailor).
'wad' in reverse letter order is 'daw'.
'daw' after 'jack' is 'JACKDAW'.
(Other definitions for jackdaw that I've seen before include "Black bird" , "Thief in Rheims" , "Crows relative" , "Grey-headed crow" , "Larcenous member of crow family" .)