Approaching, pull along a road (6)

I believe the answer is:

toward

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'approaching' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?

'pull along a road' is the wordplay.
'pull along' becomes 'tow' (towing is a kind of pulling along).
'road' becomes 'rd' (abbreviation).
'tow'+'a'+'rd'='TOWARD'

Can you help me to learn more?

(Another definition for toward that I've seen is " In the direction of".)

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

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