Guardiola attending lecture that's intentionally encouraging (3,4)
I believe the answer is:
pep talk
'intentionally encouraging' is the definition.
The definition suggests a singular noun which matches the answer.
'guardiola attending lecture' is the wordplay.
'guardiola' becomes 'pep' (I can't justify this - if you can you should give a lot more credence to this answer).
'attending' is a charade indicator (letters next to each other).
'lecture' becomes 'talk' (synonyms).
'pep'+'talk'='PEP TALK'
'that's' is the link.
Can you help me to learn more?
(Other definitions for pep talk that I've seen before include "Encouraging chat" , "one given by investment adviser in the nineties?" , "Enthusiastic chat" , "Speech of exhortation" , "Invigorating address" .)