Redundant old male, in a sense (3,4)
I believe the answer is:
too much
'redundant' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?
'old male in a sense' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'male' becomes 'm' (common abbreviation).
'in' indicates putting letters inside.
'a sense' becomes 'touch' (touch is a kind of sense).
'o'+'m'='om'
'om' inserted inside 'touch' is 'TOO MUCH'.
Can you help me to learn more?
(Other definitions for too much that I've seen before include "See 17" , "Existing in excessive quantity" , "Beyond endurance" , "Excessive, overwhelming" , "American expression of approval" .)