As slaver, master holding nothing back (5)

I believe the answer is:

drool

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'as slaver' is the definition.
'drool' can be an answer for 'slaver' (synonyms). I'm unsure of the 'as' bit.

'master holding nothing back' is the wordplay.
'master' becomes 'lord' (synonyms).
'holding' is an insertion indicator.
'nothing' becomes 'O' (O resembles 0).
'back' shows that the letters should be reversed in order.
'lord' enclosing 'o' is 'loord'.
'loord' reversed gives 'DROOL'.

Can you help me to learn more?

(Other definitions for drool that I've seen before include "Slobber" , "Spill saliva" , "Slaver - drivel" , "Salivate" , "Show excitement" .)

I've seen this clue in The Guardian.

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