Standing in bit of iguana dung, I step awkwardly (10)
I believe the answer is:
deputising
'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".)