Crossword Genius

Of no value to Britten leaving business letter (7)

Ross

I believe the answer is:

useless

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

'of no' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'value to britten leaving business letter' is the wordplay.
I cannot really understand how this works, but
'value' could be 'use' (I've seen this before) and 'use' is located in the answer.
'letter' could be 'ess' (I've seen this before) and 'ess' is found in the answer.
A single letter 'l' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for useless that I've seen before include "Far from impressive" , "Serving no practical purpose" , "Lacking in purpose" , "Incompetent" , "nohoper?" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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