Economise on curtain fabric and parking (6)
I believe the answer is:
scrimp
'economise' is the definition.
(I've seen this before)
'curtain fabric and parking' is the wordplay.
'curtain fabric' becomes 'scrim' (I've seen this in another clue).
'and' means one lot of letters go next to another.
'parking' becomes 'p' (abbreviation on road signs).
'scrim'+'p'='SCRIMP'
'on' is the link.
(Other definitions for scrimp that I've seen before include "Treat stingily" , "Subsist on a meagre allowance; be thrifty" , "Watch the pennies" , "Beer maker" , "Be economical and sparing" .)