Small amount of pesto on a stew (8)
I believe the answer is:
teaspoon
'small amount' is the definition.
'teaspoon' can be an answer for 'amount' (teaspoon is a kind of amount). I am unsure of the 'small' bit.
'pesto on a stew' is the wordplay.
'stew' is an anagram indicator.
'pesto'+'on'+'a'='pestoona'
'pestoona' anagrammed gives 'TEASPOON'.
'of' is the link.
Can you help me to learn more?
(Other definitions for teaspoon that I've seen before include "Cooking unit" , "Cutlery accompanying a cuppa" , "With OAP onset, use it at table" , "5 ml container" , "Domestic stirrer" .)