O lord, what a mess - simply drivel! (5)

I believe the answer is:

drool

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'simply drivel' is the definition.
'drool' can be an answer for 'drivel' (synonyms). I'm not certain of the 'simply' bit.

'o lord what a mess' is the wordplay.
'what a mess' indicates anagramming the letters.
'o'+'lord'='olord'
'olord' anagrammed gives 'DROOL'.

Can you help me to learn more?

(Other definitions for drool that I've seen before include "Slobber" , "Show excitement" , "Let saliva run from the mouth" , "dribble" , "Spill saliva" .)

I've seen this clue in the Evening Standard.

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