Collect grand covering bank (5)
I believe the answer is:
glean
'collect' is the definition.
(I know that glean is a kind of collect)
'grand covering bank' is the wordplay.
'grand' becomes 'g' (G is short for grand as in a thousand).
'covering' is a charade indicator (letters next to each other) (on top of in down clue).
'bank' becomes 'lean' (bank can mean to lean or tilt).
'g'+'lean'='GLEAN'
(Other definitions for glean that I've seen before include "Gather (after reapers)" , "Collect small pieces" , "Gather; collect gradually" , "Gather (info or the harvest)" , "Garner" .)