With nothing but fifty quid, he founded Jodrell Bank (6)
I believe the answer is:
lovell
'fifty quid he founded jodrell bank' is the definition.
The definition suggests a singular noun which matches the answer.
'with nothing but' is the wordplay.
'with' says to put letters next to each other.
'nothing' becomes 'love' (love is zero in tennis).
'but' becomes 'll' (I can't explain this - if you can you should give a lot more credence to this answer).
'love' next to 'll' is 'LOVELL'.
Can you help me to learn more?
(Other definitions for lovell that I've seen before include "Sir Bernard --, scientist" , "Bernard ___ , pioneer of radio astronomy, d. 2012" , "Sir Bernard -, Br. astro-nomer (Jodrell Bank)" .)