It transpires that a stew needs stirring (5)
I believe the answer is:
sweat
'it transpires' is the definition.
The definition suggests a singular noun which matches the answer.
'a stew needs stirring' is the wordplay.
'needs stirring' indicates an anagram (I've seen this in other clues).
'a'+'stew'='astew'
'astew' with letters rearranged gives 'SWEAT'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for sweat that I've seen before include "Soldier" , "Toil" , "Male perspiration?" , "Waste (anag.)" , "(Of argument) intense" .)