Group, Liberal in general (7)

I believe the answer is:

cluster

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'group liberal in general' is the definition.
'cluster' can be an answer for 'group' (I've seen this before). I'm not certain of the 'liberal in general' bit.

'group liberal in general' is the wordplay.
'group liberal' becomes 'l' (abbreviation. I am not sure about the 'group' bit.).
'in' indicates putting letters inside.
'general' becomes 'custer' (I've seen this before).
'l' inserted inside 'custer' is 'CLUSTER'.

Can you help me to learn more?

(Other definitions for cluster that I've seen before include "A bunch for cutlers" , "Group, clump" , "Assemblage" , "Close group of things" , "Come together" .)

I've seen this clue in The Telegraph.

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