Shorten second wave (6)

I believe the answer is:

scrimp

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'shorten' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how one could define the other.

'second wave' is the wordplay.
'second' becomes 's' (common abbreviation).
'wave' becomes 'crimp' (crimping is a kind of waving).
's'+'crimp'='SCRIMP'

Can you help me to learn more?

(Other definitions for scrimp that I've seen before include "Live meagrely" , "Treat stingily" , "Watch the pennies" , "Make too small, stint" , "Beer maker" .)

I've seen this clue in The Independent.

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