The smoke will get in your hair (7)
I believe the answer is:
incense
'the smoke' is the definition.
(I've seen this before)
'in your hair' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
The remaining letters 'cense' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'will get' acts as a link.
Can you help me to learn more?
(Other definitions for incense that I've seen before include "Material with fragrant fumes" , "It produces a fragrant odour when burned" , "Exasperate" , "Anger - holy smoke!" , "Perfume - inflame with anger" .)