Crossword Genius

Might it deter free camping? (7)

Ross

I believe the answer is:

trident

I'm a little stuck... Click here to teach me more about this clue!

'might it deter' is the definition.
I can't judge whether this defines the answer.

'free camping?' is the wordplay.
I cannot quite understand how this works, but
'free' could be 'rid' (to be free of something is to be rid of it) and 'rid' is present in the answer.
'camping?' could be 'tent' (I've seen this in other clues) and 'tent' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for trident that I've seen before include "spear carried at sea" , "Three-pronged weapon" , "Neptune's spear - missile" , "Neptune's or Britannia's spear" , "Spear held by Neptune or Britannia" .)

I've seen this clue in The Times.
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