Novice at wheel ex-students call a name: 'he who works with pots' (10)

'he who works with pots' is the definition.
(a lobster pot traps lobsters)

'novice at wheel ex-students call a name' is the wordplay.
'novice at wheel' becomes 'L' (as in L-plates on a learner driver's car).
'ex-students' becomes 'obs' (abbreviation for old boys, private school alumni).
'call' becomes 'term' (to term something is to call it something).
'name' becomes 'n' (common abbreviation e.g. on forms).
'l'+'obs'+'term'+'a'+'n'='LOBSTERMAN'