Crossword Genius

All-round measurement (5)

Ross

I believe the answer is:

girth

I'm a little stuck... Click here to teach me more about this clue!

'measurement' is the definition.
(thesaurus)

'all-round' is the wordplay.
I cannot quite see how this works, but
'round' could be 'girt' (girting is a kind of rounding) and 'girt' is present in the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for girth that I've seen before include "Distance around a person's body" , "Band around a horse's belly" , "Body's circumference around the middle" , "Distance round the middle" , "Measurement around the waist" .)

I've seen this clue in the Evening Standard.
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