Type of storage facility with irregular entry (6,6)
I believe the answer is:
random access
'type of storage facility' is the definition.
The definition suggests a singular noun which matches the answer.
'with irregular entry' is the wordplay.
'with' says to put letters next to each other.
'irregular' becomes 'random' (I've seen this before).
'entry' becomes 'access' (I've seen this before).
'random' put next to 'access' is 'RANDOM-ACCESS'.
Can you help me to learn more?
(Other definitions for random access that I've seen before include "Using data-transfer method" , "Like some computer memories" , "data retrieval system - with 24a" , "(Of computer memory) able to be read in non-sequential order" , "The RA in computing term RAM" .)