One could make you securer (7)

I believe the answer is:

rescuer

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'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'could make you securer' is the wordplay.
'could make you' is an anagram indicator.
'securer' anagrammed gives 'RESCUER'.

Can you help me to learn more?

(Other definitions for rescuer that I've seen before include "One who saves from a dangerous situation" , "freer" , "One who delivers" , "Deliverer (from danger)" , "One who saves someone" .)

I've seen this clue in The Telegraph.

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