Crossword Genius

Drag a monarch to the place of incarceration (5)

Ross

I believe the answer is:

tower

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

'the place of incarceration' is the definition.
I can't tell whether this definition defines the answer.

'drag a monarch' is the wordplay.
'drag' becomes 'tow' (towing is a kind of dragging).
'a monarch' becomes 'er' (abbreviation for Elizabeth Regina, British Queen).
'tow'+'er'='TOWER'

'to' is the link.

Can you help me to learn more?

(Other definitions for tower that I've seen before include "Perhaps keep" , "Campanile, spire etc" , "Stand very high (over)" , "tractor, perhaps" , "Skyscraper" .)

I've seen this clue in the Evening Standard.
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