Crossword Genius

Standing in bit of iguana dung, I step awkwardly (10)

Ross

I believe the answer is:

deputising

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'standing' is the definition.
Although both the answer and definition are present participle verbs, I can't see how one could define the other.

'bit of iguana dung i step awkwardly' is the wordplay.
'bit of' suggests taking the first letters.
'awkwardly' is an anagram indicator.
The first letter of 'iguana' is 'i'.
'i'+'dung'+'i'+'step'='idungistep'
'idungistep' is an anagram of 'DEPUTISING'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for deputising that I've seen is " Standing in for".)

I've seen this clue in The Independent.
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