Son went off and felt intense passion (10)
I believe the answer is:
smouldered
'felt intense passion' is the definition.
'smouldered' can be an answer for 'felt' (smouldering is a kind of feeling). I am not certain of the 'intense passion' bit.
'son went off' is the wordplay.
I cannot quite understand how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is located in the answer.
The remaining letters 'mouldered' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for smouldered that I've seen before include "harboured bad emotions" , "slowly burned" , "nearly burned" .)