Expert in Tours developed a lump (10)
I believe the answer is:
protrusion
'a lump' is the definition.
(thesaurus)
'expert in tours developed' is the wordplay.
'expert' becomes 'pro' (short for professional).
'developed' indicates an anagram.
'in'+'tours'='intours'
'intours' with letters rearranged gives 'trusion'.
'pro'+'trusion'='PROTRUSION'
I've seen this clue in The Daily Express.
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