Crossword Genius

Inmates don't have to join the competition (5)

Ross

I believe the answer is:

enter

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

'join the competition' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for enter that I've seen before include "Enlist, join up" , "Fill in" , "Set foot in" , "Enrol" , "Make a record of" .)

I've seen this clue in The Irish Independent.
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