Kids behind head of town crier may want one (6)
I believe the answer is:
tissue
'crier may want one' is the definition.
'kids behind head of town' is the wordplay.
'kids' becomes 'issue' (legal term for a person's children).
'behind' says to put letters next to each other.
'head of' says to take the initial letters.
The initial letter of 'town' is 't'.
'issue' put after 't' is 'TISSUE'.
(Other definitions for tissue that I've seen before include "Thin, absorbent paper" , "cell block?" , "full of lies?" , "used to make up lies?" , "Thin skin for suites" .)