Masters getting offspring work in cathedral, for instance (6)

I believe the answer is:

masons

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'masters getting offspring work in cathedral for instance' is the definition.
I can't tell whether this definition defines the answer.

'masters getting offspring' is the wordplay.
'masters' becomes 'MAs' (more than one Master of Arts graduate).
'getting' indicates putting letters inside.
'offspring' becomes 'son' (male offspring).
'mas' placed around 'son' is 'MASONS'.

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(Other definitions for masons that I've seen before include "They work with stone and brick" , "Craftsmen working in stone" , "Workers with stone - may be Free" , "Stoneworkers - may be free" .)

I've seen this clue in The Irish Times.

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