He takes stock (6,5)

'he takes stock' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'he takes stock' is the wordplay.
I cannot quite see how this works, but
'he' could be 'hi' and 'hi' is found in the answer.
'stock' could be 'cattle' (I've seen this before) and 'cattle' is located in the answer.
The remaining letters 'tef' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?