Memorial soldiers found in playground (5)
I believe the answer is:
relic
'memorial' is the definition.
(object kept to remember a holy person)
'soldiers found in playground' is the wordplay.
'soldiers' becomes 'li' (I can't explain this - if you can you should believe this answer much more).
'found in' is an insertion indicator.
'playground' becomes 'rec' (I've seen this in other clues).
'li' placed within 'rec' is 'RELIC'.
Can you help me to learn more?
(Other definitions for relic that I've seen before include "Revered religious remnant" , "antique item" , "Memorial object" , "Surviving artefact" , "Hangover from an earlier time" .)