Behold, the fellow stuck in spring despaired (4,5)
I believe the answer is:
lost heart
'despaired' is the definition.
(I've seen this before)
'behold the fellow stuck in spring' is the wordplay.
'behold' becomes 'lo'.
'the fellow' becomes 'he' (I've seen this in other clues).
'stuck in' indicates putting letters inside.
'spring' becomes 'start' (**).
'he' placed within 'start' is 'stheart'.
'lo'+'stheart'='LOST HEART'
(Other definitions for lost heart that I've seen before include "disillusioned" , "Despaired" , "Gave up" .)