Part of spring is damper -- field to get cut occasionally (5)
I believe the answer is:
april
'part of spring' is the definition.
(April is a spring month)
'damper field to get cut occasionally' is the wordplay.
'to get cut occasionally' indicates alternate letters (letters removed at regular intervals or occasions).
'damper'+'field'='damperfield'
The alternate letters of 'damperfield' are 'APRIL'.
'is' is the link.
(Other definitions for april that I've seen before include "Traditionally showery month" , "Reputedly showery month" , "Month of showers and of the Queen's birthday" , "First month of the year with 30 days" , "''All in an ... evening / ... airs were abroad'' (by Katherine Tynan)" .)