Read about brewer's last stout? (6)
I believe the answer is:
sturdy
'stout?' is the definition.
('sturdy' can be a synonym of 'stout')
'read about brewer's last' is the wordplay.
'read' becomes 'study' ('study' can be a synonym of 'read').
'about' is an insertion indicator.
'brewer's last' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'study' enclosing 'r' is 'STURDY'.
Can you help me to learn more?
(Other definitions for sturdy that I've seen before include "Strong and sturdily built" , "Powerful" , "Firm" , "Firmly constructed" , "Well-built - strapping" .)