Deprived of beer, perhaps, by a certain measure (6)
I believe the answer is:
bereft
'deprived' is the definition.
(I've seen this before)
'beer perhaps by a certain measure' is the wordplay.
'perhaps' is an anagram indicator.
'by' is a charade indicator (letters next to each other).
'a certain measure' becomes 'ft' (ft is a kind of measure. I am not sure about the 'certain' bit.).
'beer' anagrammed gives 'bere'.
'bere'+'ft'='BEREFT'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for bereft that I've seen before include "Deprived of or lacking something" , "Sorrowful through loss" , "Grief-stricken" , "Lonely and abandoned" , "Having had something precious taken away" .)