Straitlaced queen depicted in schoolbook? (6)
I believe the answer is:
primer
'depicted in schoolbook?' is the definition.
'primer' can be an answer for 'schoolbook?' (primer is a kind of schoolbook). I'm unsure of the 'depicted in' bit.
'straitlaced queen' is the wordplay.
'straitlaced' becomes 'prim' (synonyms).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'prim'+'er'='PRIMER'
Can you help me to learn more?
(Other definitions for primer that I've seen before include "Initial coat of paint" , "instructive book" , "He charges" , "it might be used by one 7 [PAINTING]" , "Solitary" .)