Crossword Genius

Motor’s gauge deep, so adjusted (6)

Ross

I believe the answer is:

speedo

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'motor's gauge' is the definition.
The definition suggests a singular noun which matches the answer.

'deep so adjusted' is the wordplay.
'adjusted' indicates an anagram.
'deep'+'so'='deepso'
'deepso' with letters rearranged gives 'SPEEDO'.

Can you help me to learn more?

(Other definitions for speedo that I've seen before include "one gives you the going rate" , "Mph indicator" , "reading from this" , "The clock (in a car)" , "It measures rate of progress" .)

I've seen this clue in The Times.
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