Nag babe to replace soft seat (7)

I believe the answer is:

beanbag

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'soft seat' is the definition.
'beanbag' can be an answer for 'seat' (I've seen this before). I'm not sure about the 'soft' bit.

'nag babe to replace' is the wordplay.
'to replace' indicates an anagram (I've seen 'replaced' mean this).
'nag'+'babe'='nagbabe'
'nagbabe' is an anagram of 'BEANBAG'.

Can you help me to learn more?

(Other definitions for beanbag that I've seen before include "Large cushion filled with granules" , "Small cloth sack thrown in children's games" , "Large cushion used as a seat" , "support for student?" , "somewhere comfy to sit" .)

I've seen this clue in The Daily Express.

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