If full, perhaps, will achieve some purpose (6)
I believe the answer is:
fulfil
'achieve some purpose' is the definition.
'fulfil' can be an answer for 'achieve' (thesaurus). I am unsure of the 'some purpose' bit.
'if full perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'if'+'full'='iffull'
'iffull' is an anagram of 'FULFIL'.
'will' is the link.
Can you help me to learn more?
(Other definitions for fulfil that I've seen before include "Accomplish or bring to conclusion" , "Meet (a condition)" , "Accomplish, satisfy requirements" , "Bring about completion of" , "Bring to fruition, accomplish" .)