Hard — of hearing? (6)

I think it could be either:

Which length description are you looking for?:

trying

I believe this clue is a double definition.

'hard' is the first definition.
(similar in meaning)

'hearing?' is the second definition.
('try' can be a synonym of 'hear')

'of' acts as a link.

(Other definitions for trying that I've seen before include "Taxing" , "Annoying; sampling" , "Vexatious - having a go" , "Hearing (a case)" , "occupation of Oliver Wendell Holmes Jnr" .)

I've seen this clue in The Times.

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