For Mark we altered basic structure (9)

I believe the answer is:

framework

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

'basic structure' is the definition.
'framework' can be an answer for 'structure' (framework is a kind of structure). I'm not certain of the 'basic' bit.

'for mark we altered' is the wordplay.
'altered' is an anagram indicator.
'for'+'mark'+'we'='formarkwe'
'formarkwe' anagrammed gives 'FRAMEWORK'.

Can you help me to learn more?

(Other definitions for framework that I've seen before include "Structure, skeleton" , "Underlying structure" .)

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app