Crossword Genius

Bronze lavvy functions (8)

Ross

I believe the answer is:

tangents

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'functions' is the definition.
(I know this)

'bronze lavvy' is the wordplay.
'bronze' becomes 'tan' (both can mean to get a sun tan).
'lavvy' becomes 'gents' (I can't justify this - if you can you should give a lot more credence to this answer).
'tan'+'gents'='TANGENTS'

Can you help me to learn more?

(Other definitions for tangents that I've seen before include "Straight lines - ten gnats (anag)" , "Straight lines that touch curves" , "Straight lines that touche curves" , "Touching lines" , "Straight lines that touch but don't intersect a curve" .)

I've seen this clue in The Telegraph.
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