Resolution to limit tidal feature (10)
I believe the answer is:
tiebreaker
'tidal feature' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'resolution to limit' is the wordplay.
'resolution' becomes 'breaker' (I am not sure about this - if you are sure you should believe this answer much more).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'limit' becomes 'tie' (tying is a kind of limiting).
'breaker' put after 'tie' is 'TIEBREAKER'.
Can you help me to learn more?
(Other definitions for tiebreaker that I've seen before include "Game decider" , "A means of separating equal winners" , "It's decisive" , "settler" .)