Peer behind castle and remember the total (4,5)

I believe the answer is:

keep count

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'remember the total' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'peer behind castle' is the wordplay.
'peer' becomes 'count'.
'behind' means one lot of letters go next to another.
'castle' becomes 'keep' (keep is a type of castle).
'count' put after 'keep' is 'KEEP COUNT'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for keep count that I've seen before include "score" , "Check the gate perhaps" .)

I've seen this clue in The Daily Express.

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