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In the field, it's a credit and an eye-opener (4)

Ross

I believe the answer is:

acre

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

'in the field' is the definition.
I can't tell whether this definition defines the answer.

'a credit and an eye-opener' is the wordplay.
'credit' becomes 'cr'.
'and' means one lot of letters go next to another.
'opener' suggests taking the first letters.
The initial letter of 'eye' is 'e'.
'a'+'cr'+'e'='ACRE'

'it's' is the link.

Can you help me to learn more?

(Other definitions for acre that I've seen before include "Unit of land area" , "0.405 of a hectare" , "Israeli seaport" , "Ancient city in Israel" , "Area measure - Israeli port - Brazilian state" .)

I've seen this clue in the Evening Standard.
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