Cheerful bachelor landed male part (10)

I believe the answer is:

blithesome

'cheerful' is the definition.
('blithesome' can be a synonym of 'cheerful')

'bachelor landed male part' is the wordplay.
'bachelor' becomes 'b' (abbreviation e.g. BA=Bachelor of Arts).
'landed' becomes 'lit' (I've seen this in other clues).
'male' becomes 'he'.
'part' becomes 'some' (I've seen this before**).
'b'+'lit'+'he'+'some'='BLITHESOME'

(Another definition for blithesome that I've seen is " Cheery".)

I've seen this clue in The Telegraph.

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