Crossword Genius

Pine store's not opened (4)

Ross

I believe the answer is:

ache

'pine' is the definition.
(I've seen this before)

'store's not opened' is the wordplay.
'store' becomes 'cache' (cache is a kind of store).
'not opened' means to remove the first letter.
'cache' with its initial letter taken away is 'ACHE'.

(Other definitions for ache that I've seen before include "Hurt; yearn" , "Feel sore" , "agony" , "strong feeling" , "Shakespearean character" .)

I've seen this clue in The Independent.
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