Solitary one criticised about love (8)
I believe the answer is:
isolated
'solitary' is the definition.
(I've seen this before)
'one criticised about love' is the wordplay.
'one' becomes 'i' (Roman numeral).
'criticised' becomes 'slated' (I've seen this before).
'about' means one lot of letters goes inside another.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'slated' going around 'o' is 'solated'.
'i'+'solated'='ISOLATED'
(Other definitions for isolated that I've seen before include "Set apart from others" , "Alone, set apart" , "hard to find" , "Segregated" , "Separated from others" .)