Makes casual visit to bishop restricted by medical condition (5,2)

I believe the answer is:

drops by

'makes casual visit' is the definition.

'bishop restricted by medical condition' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'restricted by' means one lot of letters goes inside another (I've seen this in other clues).
'medical condition' becomes 'dropsy' (I've seen this before).
'b' inserted within 'dropsy' is 'DROPS BY'.

'to' is the link.

I've seen this clue in The Times.

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