Tow-headed boy, perhaps in jug (4)
I believe the answer is:
toby
'jug' is the definition.
(I've seen this before)
'tow-headed boy perhaps in' is the wordplay.
'tow-headed' becomes 't' (this might be a standard abbreviation I've not previously seen).
'perhaps' is an anagram indicator.
'in' is an insertion indicator.
'boy' anagrammed gives 'oby'.
't' inserted into 'oby' is 'TOBY'.
Can you help me to learn more?
(Other definitions for toby that I've seen before include "dog with frill round neck" , "Mr Punch's dog, beer-jug" , "Belch, perhaps" , "fellow" , "This Jug is like man with three-cornered hat" .)