Crossword Genius

Are inside keeping some measure of control (5)

Ross

I believe the answer is:

reins

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

'measure of control' is the definition.
'reins' can be an answer for 'control' (I've seen this in another clue). I'm not sure about the 'measure of' bit.

'are inside keeping some' is the wordplay.
'some' says the answer is hidden in the clue.
'REINS' can be found hidden inside 'are inside keeping'.

Can you help me to learn more?

(Other definitions for reins that I've seen before include "Checks" , "Means of controlling a horse" , "Control for horses" , "Guiding straps" , "water regulators?" .)

I've seen this clue in The Independent.
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