Can You Help With This Clue Please?

[braverino]

11 across 'one long imprisoned in doomed fort's war cry of old'. Thank you.

[shoota]

How many letters and do you have any placed?

[braverino]

9 letters ------mo-

[shoota]

This is what the interweb says, how it goes together I know not:

11a (“One long imprisoned in doomed fort’s war cry of old”) One of the ‘star’ words in the 12th edition of Chambers which was unfortunately omitted from the 13th edition (a complete, printable list can be found here), this is LAG (‘One long imprisoned’) in ALAMO’S (“doomed fort’s”).

[shoota]

alalagmos /a-la-lag-mos/ (Gr) n (pl alalag-moi) a war cry, cry of alalai

[shoota]

http://www.thefreedictionary.com/alalagmos

[Captain2]

Nice one shoota; put me out of my misery too; can now go back to dinner and the beer.

[Captain2]

Which crossword is it please, braverino?

[shoota]

Azed 2,292

[Captain2]

Thanks again shoota

[braverino]

Thanks Shoota!

[shoota]

Welcome. :-)