The most common and most likely answer to this crossword clue is the 4 plus 11 letter word HOME SECRETARIES
H
O
M
E
S
E
C
R
E
T
A
R
I
E
S
More clues leading to the result HOME SECRETARIES
Buddy explains!
The straight part
We know that "MPs given big job" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mps given big job = home secretaries.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.