Concerning sex had when tense adult's held in wind (6)

'concerning sex had' is the definition.
I can't judge whether this definition defines the answer.

'tense adult's held in wind' is the wordplay.
'tense' becomes 't' (grammatical abbreviation).
'adult' becomes 'a' (abbreviation).
'held in' means one lot of letters goes inside another.
'wind' becomes 'coil' (coiling is a kind of winding).
't'+'a'='ta'
'ta' inserted into 'coil' is 'COITAL'.

'when' acts as a link.

Can you help me to learn more?