1980s pop star was inflexible (7)
I believe the answer is:
adamant
'inflexible' is the definition.
(similar in meaning)
'1980s pop star' is the wordplay.
I cannot quite see how this works, but
'pop' could be 'da' (both can mean someone's father) and 'da' is found in the answer.
The remaining letters 'amant' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'was' acts as a link.
Can you help me to learn more?
(Other definitions for adamant that I've seen before include "Legendary rock" , "Refusing to change opinion" , "Hard and unrelenting" , "Positive and unrelenting" , "intractable" .)