Crossword Genius

Constant pain in store (5)

Ross

I believe the answer is:

cache

'store' is the definition.
(cache is a kind of store)

'constant pain' is the wordplay.
'constant' becomes 'c' (mathematical abbreviation).
'pain' becomes 'ache' (ache is a kind of pain**).
'c'+'ache'='CACHE'

'in' is the link.

(Other definitions for cache that I've seen before include "memory" , "(Place in) hidden store" , "Conceal" , "Nest egg" , "Secret source" .)

I've seen this clue in The Telegraph.
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