Overcome about fifty in heaven (5)

I believe the answer is:

blest

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'heaven' is the definition.
The answer and definition are not the same part of speech.

'overcome about fifty' is the wordplay.
'overcome' becomes 'best' (besting is a kind of overcoming).
'about' means one lot of letters goes inside another.
'fifty' becomes 'l' (Roman numeral).
'best' placed around 'l' is 'BLEST'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for blest that I've seen before include "Made holy (archaic)" , "- Pair of Sirens (Parry)" , "Consecrated" , "Highly-favoured" .)

I've seen this clue in the Sydney Morning Herald.

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