A lb50 total (3)

I believe the answer is:

all

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

'total' is the definition.
(I've seen this in another clue)

'a lb50' is the wordplay.
'lb50' becomes 'll' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'ll'='ALL'

Can you help me to learn more?

(Other definitions for all that I've seen before include "Entirely; everyone" , "Long avenue or garden path" , "'Bless 'em - - ' (song)" , "Everyone - complete" , "without exception" .)

I've seen this clue in the Evening Standard.

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