Type of point in consideration, initially (5)
I believe the answer is:
topic
'type' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'point in consideration initially' is the wordplay.
'point' becomes 'top' (top is a kind of point).
'initially' indicates taking the first letters.
The first letters of 'in consideration' is 'ic'.
'top'+'ic'='TOPIC'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for topic that I've seen before include "Question" , "Issue (for discussion)" , "Theme of discourse" , "'Theme, subject (5)'" , "Talking point" .)