Somehow hit road, or part of it (5)

I believe the answer is:

third

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'part of it' is the definition.
'third' can be an answer for 'part' (fraction). I am not sure about the 'of it' bit.

'somehow hit road' is the wordplay.
'somehow' indicates an anagram.
'road' becomes 'rd' (abbreviation).
'hit' anagrammed gives 'thi'.
'thi'+'rd'='THIRD'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for third that I've seen before include "Ruthless interrogation" , "Tertiary" , "Last of three" , "Bronze medal position" , "degree" .)

I've seen this clue in The Mirror.

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