British astronomer, mostly delightful and congenial in the end (6)

I believe the answer is:

lovell

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'british astronomer' is the definition.
'lovell' can be an answer for 'astronomer' (I've seen this before). I am not sure about the 'british' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lovell that I've seen before include "Bernard ___ , pioneer of radio astronomy, d. 2012" , "Sir Bernard -, Br. astro-nomer (Jodrell Bank)" , "Sir Bernard --, scientist" .)

I've seen this clue in The Independent.

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