In brief this is another word for newt (3)
I believe the answer is:
eft
'for newt' is the definition.
(eft is a kind of newt)
'in brief this is' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EFT' can be found hidden inside 'brief this is'.
'another word' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for eft that I've seen before include "Young newt" , "Swimmer with feeble legs" , "Newt (archaic)" , "Juvenile twenty-three Ac; rhymes with sinister" , "Juvenile newt" .)