Perhaps seventh word in a limerick's too long for it (7)
I believe the answer is:
ordinal
'perhaps seventh' is the definition.
'ordinal' can be an answer for 'seventh' (similar in meaning). I am unsure of the 'perhaps' bit.
'word in a limerick's too long for it' is the wordplay.
'ORDINAL' is hidden within the letters.
But, I'm uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for ordinal that I've seen before include "Denoting a numerical order in a series" , "Maybe first" , "First, for One" , "Numeral indicating rank order" , "gives position in class" .)