It should ensure delivery of the whole speech (4,7)

I believe the answer is:

full address

I'm a little stuck... Click here to teach me more about this clue!

'it should ensure delivery of' is the definition.
The definition suggests a singular noun which matches the answer.

'whole speech' is the wordplay.
'whole' becomes 'full' (similar in meaning).
'speech' becomes 'address' (synonyms).
'full'+'address'='FULL ADDRESS'

'the' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app