Iron horse accommodated an outfit of naval recruiters (5,4)
I believe the answer is:
press gang
'recruiters' is the definition.
(I have seen 'Forcible recruiters ' mean 'press gang' so perhaps 'recruiters' could also mean 'press gang')
'iron horse accommodated an outfit of naval' is the wordplay.
I cannot really understand how this works, but
'iron' could be 'press' (I've seen this before) and 'press' is located in the answer.
'an' could be 'a' and 'a' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for press gang that I've seen before include "load of people to hang around outside Downing Street?" , "group of journos?" , "Group forcibly enlisting for service" , "Forcible recruiters" , "One could have made you serve" .)