Crossword Genius

Fastest part of UK motorway, optimum to go around 50 (8)

Ross

I believe the answer is:

nimblest

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

'fastest' is the definition.
Both the answer and definition are superlative adjectives. Perhaps you can see a link between them that I don't see?

'part of uk motorway optimum to go around 50' is the wordplay.
'part of uk' becomes 'NI' (Northern Ireland).
'motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'optimum' becomes 'best' (similar in meaning).
'to go around' indicates putting letters inside.
'50' becomes 'l' (Roman numeral).
'best' enclosing 'l' is 'blest'.
'ni'+'m'+'blest'='NIMBLEST'

Can you help me to learn more?

(Another definition for nimblest that I've seen is " Most agile, mentally of physically".)

I've seen this clue in The Independent.
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