Amount political party initially tucked inside secret location (7)
I believe the answer is:
sanctum
'secret location' is the definition.
'sanctum' can be an answer for 'location' (sanctum is a kind of location). I'm not certain of the 'secret' bit.
'amount political party initially tucked inside' is the wordplay.
'amount' becomes 'sum' (synonyms).
'political party' becomes 'ANC' (African National Congress, South African party).
'initially' suggests taking the first letters.
'inside' is an insertion indicator.
The first letter of 'tucked' is 't'.
'anc'+'t'='anct'
'sum' placed around 'anct' is 'SANCTUM'.
Can you help me to learn more?
(Other definitions for sanctum that I've seen before include "Private place, may be inner" , "Holy place, often inner" , "Place of total privacy" , "somewhere private" , "Sacred area" .)