Recreation ground on large ship features special adjustable armchairs (9)

'adjustable armchairs' is the definition.
'recliners' can be an answer for 'armchairs' (recliner is a kind of armchair). I am unsure of the 'adjustable' bit.

'recreation ground on large ship features special' is the wordplay.
'recreation ground' becomes 'c' (I can't justify this - if you can you should believe this answer much more).
'on' becomes 're' ('on' can be mean 'with reference to').
'large ship' becomes 'liner' (I've seen this in another clue).
'features' means one lot of letters goes inside another.
'special' becomes 'S' (common abbreviation as in Special Air Service).
're'+'liner'='reliner'
'c' going into 'reliner' is 'recliner'.
'recliner'+'s'='RECLINERS'

Can you help me to learn more?