Suspicious phone call about drug packaging, that's clear (10)

'packaging that's clear' is the definition.
I can't tell whether this defines the answer.

'suspicious phone call about drug' is the wordplay.
'suspicious' indicates an anagram (an unusual or suspect spelling).
'about' means one lot of letters goes inside another.
'drug' becomes 'e' (E is another name for ecstasy).
'phone'+'call'='phonecall'
'phonecall' is an anagram of 'cllophane'.
'cllophane' placed around 'e' is 'CELLOPHANE'.

Can you help me to learn more?