Unconvincing feel about opening of bowling, English (6)
I believe the answer is:
feeble
'unconvincing' is the definition.
(I've seen this before)
'feel about opening of bowling english' is the wordplay.
'about' means one lot of letters goes inside another.
'opening of' suggests taking the first letters.
'english' becomes 'e' (abbreviation).
The initial letter of 'bowling' is 'b'.
'feel' placed around 'b' is 'feebl'.
'feebl'+'e'='FEEBLE'
(Other definitions for feeble that I've seen before include "Very weak, infirm" , "rather weak" , "Weak, frail" , "lacking resolve" , "Physically weak or lacking effectiveness" .)