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'm not certain of the 'of it' bit.

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

'or' is the 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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