In case, run out and find cover (9)
I believe the answer is:
insurance
'cover' is the definition.
(I've seen this before)
'in case run out and find' is the wordplay.
'out' means to remove the last letter.
'and' becomes 'n' (common abbreviation for 'and').
'find' indicates anagramming the letters.
'run' with its last letter removed is 'ru'.
'case'+'ru'+'n'='caserun'
'caserun' anagrammed gives 'surance'.
'in'+'surance'='INSURANCE'
(Other definitions for insurance that I've seen before include "One's questioned taking this out" , "Guarantee of compensation in return for a premium" , "Cover against loss" , "Promise of reimbursement in the case of loss" , "Indemnity" .)