Leatherhead's right on the map, though not in the greatest way (5)

I believe the answer is:

least

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'not in the greatest way' is the definition.
I can't judge whether this definition defines the answer.

'leatherhead's right on the map' is the wordplay.
'leatherhead' becomes 'l' (head letter of 'leather').
'right on the map' becomes 'east' (I've seen this in another clue).
'l'+'east'='LEAST'

'though' acts as a link.

Can you help me to learn more?

(Other definitions for least that I've seen before include "Smallest, slightest" , "Smallest (in significance)" , "Smallest, being stale" , "Smallest in extent" , "Bottom" .)

I've seen this clue in the Evening Standard.

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