Gains access for resident with no ID (6)
I believe the answer is:
enters
'gains' is the definition.
The definition and answer can be both related to competing as well as being verbs in their -s form.
Perhaps there's a link between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for enters that I've seen before include "Records, in a diary say" , "Comes in" , "Goes in or records in book" , "Goes inside" , "Registers for a competition, say" .)