Morale booster kept pal involved (3,4)
I believe the answer is:
pep talk
'morale booster' is the definition.
(talk to boost morale or energy)
'kept pal involved' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'kept'+'pal'='keptpal'
'keptpal' anagrammed gives 'PEP TALK'.
(Other definitions for pep talk that I've seen before include "Gee-up speech" , "Enthusiastic chat" , "Inspiring address" , "Invigorating address" , "one given by investment adviser in the nineties?" .)