Strongly built boxer finishes with various bouts (6)
I believe the answer is:
robust
'strongly built' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can occasionally define each other.
'boxer finishes with various bouts' is the wordplay.
'finishes' says to take the final letters (I've seen 'finish of' mean this).
'with' says to put letters next to each other.
'various' indicates anagramming the letters.
The final letter of 'boxer' is 'r'.
'bouts' anagrammed gives 'obust'.
'r'+'obust'='ROBUST'
Can you help me to learn more?
(Other definitions for robust that I've seen before include "Sturdy, resilient" , "Physically strong" , "Athletic" , "firm!" , "Forceful" .)