Crossword Genius

On Mars, perhaps, one could refuse to be held to it (6)

Ross

I believe the answer is:

ransom

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'one could refuse to be held to it' is the definition.
I can't judge whether this defines the answer.

'on mars perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'on'+'mars'='onmars'
'onmars' is an anagram of 'RANSOM'.

Can you help me to learn more?

(Other definitions for ransom that I've seen before include "Rescue" , "Fee for kidnap release" , "Payment for the release of someone" , "demand an extortionate price" , "Means to release prisoner" .)

I've seen this clue in the Evening Standard.
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