A little upright creature? (7)

I believe the answer is:

tadpole

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'creature?' is the definition.
(tadpole is a kind of animal)

'a little upright' is the wordplay.
'a little' becomes 'tad' (both can mean a small amount).
'upright' becomes 'pole' (I am not sure about this - if you are sure you should believe this answer much more).
'tad'+'pole'='TADPOLE'

Can you help me to learn more?

(Other definitions for tadpole that I've seen before include "Future frog maybe" , "Frog in the making" , "Amphibian larva" , "youngster" , "Immature toad or frog" .)

I've seen this clue in the Evening Standard.

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