Find it difficult, though you are in employment (4,1,3)

I believe the answer is:

have a job

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

'find it difficult though you' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'are in employment' is the wordplay.
I cannot really see how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is present in the answer.
'employment' could be 'job' (synonyms) and 'job' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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