Viscous substance, say, is flipped with tongue (7)

I believe the answer is:

gelatin

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'viscous substance' is the definition.
'gelatin' can be an answer for 'substance' (gelatin is a kind of substance). I am not certain of the 'viscous' bit.

'say is flipped with tongue' is the wordplay.
'say' becomes 'eg'.
'is flipped' is a reversal indicator.
'with' says to put letters next to each other.
'tongue' becomes 'latin' (Latin is an example).
'eg' in reverse letter order is 'ge'.
'ge'+'latin'='GELATIN'

Can you help me to learn more?

(Other definitions for gelatin that I've seen before include "Organic glue used in foodstuffs" , "Setter" , "Colourless glue" , "Tag line (anag.); glue" , "Substance used in glue and cooking" .)

I've seen this clue in The Hindu.

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