It may have its place in modelling! (10)
I believe the answer is:
plasticine
'it may' is the definition.
The definition suggests a singular noun which matches the answer.
'its place in modelling' is the wordplay.
'modelling' is an anagram indicator.
'its'+'place'+'in'='itsplacein'
'itsplacein' anagrammed gives 'PLASTICINE'.
'have' is the link.
Can you help me to learn more?
(Other definitions for plasticine that I've seen before include "Modelling clay" , "substance used by modellers" .)