Getting married in spring? Tighten one's belt (5)
I believe the answer is:
skimp
'tighten one's belt' is the definition.
(I've seen this in another clue)
'getting married in spring?' is the wordplay.
'getting' is an insertion indicator.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'in spring?' becomes 'skip' (skipping is a kind of springing. I am not sure about the 'in' bit.).
'm' put into 'skip' is 'SKIMP'.
Can you help me to learn more?
(Other definitions for skimp that I've seen before include "Deal with superficially" , "Be mean towards" , "Use less than is needed, be penny-pinching" , "Use less to economise" , "Expend less in an attempt to economise" .)