Occasional all day moon that's fondly remembered in Texas (5)
I believe the answer is:
alamo
'in texas' is the definition.
('Alamo' is part of 'texas')
'occasional all day moon' is the wordplay.
'occasional' means one should take alternating letters (letters taken at regular intervals or on occasion).
'all'+'day'+'moon'='alldaymoon'
The alternate letters of 'alldaymoon' are 'ALAMO'.
'that's fondly remembered' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for alamo that I've seen before include "The --, Texan mission besieged in 1836" , "national monument" , "Where Davy Crockett met his end" , "Texas mission taken by Mexican forces in 1836" , "Famous Texan mission" .)