Garment tailor has altered to accommodate height (5,5)

'garment' is the definition.
I know nothing about this answer so I can't tell whether this works.

'tailor has altered to accommodate height' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'has' is 'ash' which is located in the answer.
'height' could be 'h' (abbreviation in geometry) and 'h' is found in the answer.
an anagram of 'tailor' is 'aloirt' which is within the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?