Revolting gherkin's true reason to refuse grub? (6,6)
I believe the answer is:
hunger strike
'reason to refuse grub?' is the definition.
(grub can mean food)
'revolting gherkin's true' is the wordplay.
'revolting' indicates an anagram.
'gherkins'+'true'='gherkinstrue'
'gherkinstrue' anagrammed gives 'HUNGER-STRIKE'.
(Other definitions for hunger strike that I've seen before include "Starvation protest" , "fast" , "Non-violent protest" .)