Spread uncontrollably right through, though one fought (7)
I believe the answer is:
sparred
'one fought' is the definition.
(I've seen this in another clue)
'spread uncontrollably right through' is the wordplay.
I cannot really see how this works, but
'right' could be 'ar' (I've seen this in other clues) and 'ar' is found within the answer.
This explanation may well be incorrect...
'though' is the link.
Can you help me to learn more?
(Other definitions for sparred that I've seen before include "Fought" , "Did train at boxing" , "Boxed; argued" .)