On two occasions we let right put off fighter

I believe the answer is:

welterweight

I'm a little stuck... Click here to teach me more about this clue!

'off fighter' is the definition.
'welterweight' can be an answer for 'fighter' (welterweight is a kind of fighter). I am not certain of the 'off' bit.

'on two occasions we let right' is the wordplay.
'on two' becomes 'we' (I can't justify this - if you can you should believe this answer much more).
'occasions' indicates anagramming the letters (I've seen 'occasion' mean this).
'we'+'let'+'right'='weletright'
'weletright' anagrammed gives 'lterweight'.
'we'+'lterweight'='WELTERWEIGHT'

'put' acts as a link.

Can you help me to learn more?

(Other definitions for welterweight that I've seen before include "Boxer (147 lbs max)" , "Boxing category" .)

I've seen this clue in The Daily Mail.

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